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1 | /* | |
2 | * Interface handling (except master interface) | |
3 | * | |
4 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
5 | * Copyright 2005-2006, Devicescape Software, Inc. | |
6 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
7 | * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/slab.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/if_arp.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/rtnetlink.h> | |
18 | #include <net/mac80211.h> | |
19 | #include <net/ieee80211_radiotap.h> | |
20 | #include "ieee80211_i.h" | |
21 | #include "sta_info.h" | |
22 | #include "debugfs_netdev.h" | |
23 | #include "mesh.h" | |
24 | #include "led.h" | |
25 | #include "driver-ops.h" | |
26 | #include "wme.h" | |
27 | #include "rate.h" | |
28 | ||
29 | /** | |
30 | * DOC: Interface list locking | |
31 | * | |
32 | * The interface list in each struct ieee80211_local is protected | |
33 | * three-fold: | |
34 | * | |
35 | * (1) modifications may only be done under the RTNL | |
36 | * (2) modifications and readers are protected against each other by | |
37 | * the iflist_mtx. | |
38 | * (3) modifications are done in an RCU manner so atomic readers | |
39 | * can traverse the list in RCU-safe blocks. | |
40 | * | |
41 | * As a consequence, reads (traversals) of the list can be protected | |
42 | * by either the RTNL, the iflist_mtx or RCU. | |
43 | */ | |
44 | ||
45 | ||
46 | static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) | |
47 | { | |
48 | int meshhdrlen; | |
49 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
50 | ||
51 | meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; | |
52 | ||
53 | /* FIX: what would be proper limits for MTU? | |
54 | * This interface uses 802.3 frames. */ | |
55 | if (new_mtu < 256 || | |
56 | new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { | |
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
61 | printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); | |
62 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
63 | dev->mtu = new_mtu; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static int ieee80211_change_mac(struct net_device *dev, void *addr) | |
68 | { | |
69 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
70 | struct sockaddr *sa = addr; | |
71 | int ret; | |
72 | ||
73 | if (ieee80211_sdata_running(sdata)) | |
74 | return -EBUSY; | |
75 | ||
76 | ret = eth_mac_addr(dev, sa); | |
77 | ||
78 | if (ret == 0) | |
79 | memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
84 | static inline int identical_mac_addr_allowed(int type1, int type2) | |
85 | { | |
86 | return type1 == NL80211_IFTYPE_MONITOR || | |
87 | type2 == NL80211_IFTYPE_MONITOR || | |
88 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || | |
89 | (type1 == NL80211_IFTYPE_WDS && | |
90 | (type2 == NL80211_IFTYPE_WDS || | |
91 | type2 == NL80211_IFTYPE_AP)) || | |
92 | (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || | |
93 | (type1 == NL80211_IFTYPE_AP_VLAN && | |
94 | (type2 == NL80211_IFTYPE_AP || | |
95 | type2 == NL80211_IFTYPE_AP_VLAN)); | |
96 | } | |
97 | ||
98 | static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, | |
99 | enum nl80211_iftype iftype) | |
100 | { | |
101 | struct ieee80211_local *local = sdata->local; | |
102 | struct ieee80211_sub_if_data *nsdata; | |
103 | struct net_device *dev = sdata->dev; | |
104 | ||
105 | ASSERT_RTNL(); | |
106 | ||
107 | /* we hold the RTNL here so can safely walk the list */ | |
108 | list_for_each_entry(nsdata, &local->interfaces, list) { | |
109 | struct net_device *ndev = nsdata->dev; | |
110 | ||
111 | if (ndev != dev && ieee80211_sdata_running(nsdata)) { | |
112 | /* | |
113 | * Allow only a single IBSS interface to be up at any | |
114 | * time. This is restricted because beacon distribution | |
115 | * cannot work properly if both are in the same IBSS. | |
116 | * | |
117 | * To remove this restriction we'd have to disallow them | |
118 | * from setting the same SSID on different IBSS interfaces | |
119 | * belonging to the same hardware. Then, however, we're | |
120 | * faced with having to adopt two different TSF timers... | |
121 | */ | |
122 | if (iftype == NL80211_IFTYPE_ADHOC && | |
123 | nsdata->vif.type == NL80211_IFTYPE_ADHOC) | |
124 | return -EBUSY; | |
125 | ||
126 | /* | |
127 | * The remaining checks are only performed for interfaces | |
128 | * with the same MAC address. | |
129 | */ | |
130 | if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) | |
131 | continue; | |
132 | ||
133 | /* | |
134 | * check whether it may have the same address | |
135 | */ | |
136 | if (!identical_mac_addr_allowed(iftype, | |
137 | nsdata->vif.type)) | |
138 | return -ENOTUNIQ; | |
139 | ||
140 | /* | |
141 | * can only add VLANs to enabled APs | |
142 | */ | |
143 | if (iftype == NL80211_IFTYPE_AP_VLAN && | |
144 | nsdata->vif.type == NL80211_IFTYPE_AP) | |
145 | sdata->bss = &nsdata->u.ap; | |
146 | } | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, | |
153 | const int offset) | |
154 | { | |
155 | struct ieee80211_local *local = sdata->local; | |
156 | u32 flags = sdata->u.mntr_flags; | |
157 | ||
158 | #define ADJUST(_f, _s) do { \ | |
159 | if (flags & MONITOR_FLAG_##_f) \ | |
160 | local->fif_##_s += offset; \ | |
161 | } while (0) | |
162 | ||
163 | ADJUST(FCSFAIL, fcsfail); | |
164 | ADJUST(PLCPFAIL, plcpfail); | |
165 | ADJUST(CONTROL, control); | |
166 | ADJUST(CONTROL, pspoll); | |
167 | ADJUST(OTHER_BSS, other_bss); | |
168 | ||
169 | #undef ADJUST | |
170 | } | |
171 | ||
172 | /* | |
173 | * NOTE: Be very careful when changing this function, it must NOT return | |
174 | * an error on interface type changes that have been pre-checked, so most | |
175 | * checks should be in ieee80211_check_concurrent_iface. | |
176 | */ | |
177 | static int ieee80211_do_open(struct net_device *dev, bool coming_up) | |
178 | { | |
179 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
180 | struct ieee80211_local *local = sdata->local; | |
181 | struct sta_info *sta; | |
182 | u32 changed = 0; | |
183 | int res; | |
184 | u32 hw_reconf_flags = 0; | |
185 | ||
186 | switch (sdata->vif.type) { | |
187 | case NL80211_IFTYPE_WDS: | |
188 | if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) | |
189 | return -ENOLINK; | |
190 | break; | |
191 | case NL80211_IFTYPE_AP_VLAN: | |
192 | if (!sdata->bss) | |
193 | return -ENOLINK; | |
194 | list_add(&sdata->u.vlan.list, &sdata->bss->vlans); | |
195 | break; | |
196 | case NL80211_IFTYPE_AP: | |
197 | sdata->bss = &sdata->u.ap; | |
198 | break; | |
199 | case NL80211_IFTYPE_MESH_POINT: | |
200 | case NL80211_IFTYPE_STATION: | |
201 | case NL80211_IFTYPE_MONITOR: | |
202 | case NL80211_IFTYPE_ADHOC: | |
203 | /* no special treatment */ | |
204 | break; | |
205 | case NL80211_IFTYPE_UNSPECIFIED: | |
206 | case NUM_NL80211_IFTYPES: | |
207 | case NL80211_IFTYPE_P2P_CLIENT: | |
208 | case NL80211_IFTYPE_P2P_GO: | |
209 | /* cannot happen */ | |
210 | WARN_ON(1); | |
211 | break; | |
212 | } | |
213 | ||
214 | if (local->open_count == 0) { | |
215 | res = drv_start(local); | |
216 | if (res) | |
217 | goto err_del_bss; | |
218 | if (local->ops->napi_poll) | |
219 | napi_enable(&local->napi); | |
220 | /* we're brought up, everything changes */ | |
221 | hw_reconf_flags = ~0; | |
222 | ieee80211_led_radio(local, true); | |
223 | ieee80211_mod_tpt_led_trig(local, | |
224 | IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Copy the hopefully now-present MAC address to | |
229 | * this interface, if it has the special null one. | |
230 | */ | |
231 | if (is_zero_ether_addr(dev->dev_addr)) { | |
232 | memcpy(dev->dev_addr, | |
233 | local->hw.wiphy->perm_addr, | |
234 | ETH_ALEN); | |
235 | memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); | |
236 | ||
237 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
238 | if (!local->open_count) | |
239 | drv_stop(local); | |
240 | return -EADDRNOTAVAIL; | |
241 | } | |
242 | } | |
243 | ||
244 | switch (sdata->vif.type) { | |
245 | case NL80211_IFTYPE_AP_VLAN: | |
246 | /* no need to tell driver */ | |
247 | break; | |
248 | case NL80211_IFTYPE_MONITOR: | |
249 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
250 | local->cooked_mntrs++; | |
251 | break; | |
252 | } | |
253 | ||
254 | /* must be before the call to ieee80211_configure_filter */ | |
255 | local->monitors++; | |
256 | if (local->monitors == 1) { | |
257 | local->hw.conf.flags |= IEEE80211_CONF_MONITOR; | |
258 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; | |
259 | } | |
260 | ||
261 | ieee80211_adjust_monitor_flags(sdata, 1); | |
262 | ieee80211_configure_filter(local); | |
263 | ||
264 | netif_carrier_on(dev); | |
265 | break; | |
266 | default: | |
267 | if (coming_up) { | |
268 | res = drv_add_interface(local, &sdata->vif); | |
269 | if (res) | |
270 | goto err_stop; | |
271 | } | |
272 | ||
273 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
274 | local->fif_pspoll++; | |
275 | local->fif_probe_req++; | |
276 | ||
277 | ieee80211_configure_filter(local); | |
278 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
279 | local->fif_probe_req++; | |
280 | } | |
281 | ||
282 | changed |= ieee80211_reset_erp_info(sdata); | |
283 | ieee80211_bss_info_change_notify(sdata, changed); | |
284 | ||
285 | if (sdata->vif.type == NL80211_IFTYPE_STATION) | |
286 | netif_carrier_off(dev); | |
287 | else | |
288 | netif_carrier_on(dev); | |
289 | ||
290 | /* | |
291 | * set default queue parameters so drivers don't | |
292 | * need to initialise the hardware if the hardware | |
293 | * doesn't start up with sane defaults | |
294 | */ | |
295 | ieee80211_set_wmm_default(sdata); | |
296 | } | |
297 | ||
298 | set_bit(SDATA_STATE_RUNNING, &sdata->state); | |
299 | ||
300 | if (sdata->vif.type == NL80211_IFTYPE_WDS) { | |
301 | /* Create STA entry for the WDS peer */ | |
302 | sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, | |
303 | GFP_KERNEL); | |
304 | if (!sta) { | |
305 | res = -ENOMEM; | |
306 | goto err_del_interface; | |
307 | } | |
308 | ||
309 | /* no atomic bitop required since STA is not live yet */ | |
310 | set_sta_flag(sta, WLAN_STA_AUTHORIZED); | |
311 | ||
312 | res = sta_info_insert(sta); | |
313 | if (res) { | |
314 | /* STA has been freed */ | |
315 | goto err_del_interface; | |
316 | } | |
317 | ||
318 | rate_control_rate_init(sta); | |
319 | } | |
320 | ||
321 | /* | |
322 | * set_multicast_list will be invoked by the networking core | |
323 | * which will check whether any increments here were done in | |
324 | * error and sync them down to the hardware as filter flags. | |
325 | */ | |
326 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
327 | atomic_inc(&local->iff_allmultis); | |
328 | ||
329 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
330 | atomic_inc(&local->iff_promiscs); | |
331 | ||
332 | mutex_lock(&local->mtx); | |
333 | hw_reconf_flags |= __ieee80211_recalc_idle(local); | |
334 | mutex_unlock(&local->mtx); | |
335 | ||
336 | if (coming_up) | |
337 | local->open_count++; | |
338 | ||
339 | if (hw_reconf_flags) | |
340 | ieee80211_hw_config(local, hw_reconf_flags); | |
341 | ||
342 | ieee80211_recalc_ps(local, -1); | |
343 | ||
344 | netif_tx_start_all_queues(dev); | |
345 | ||
346 | return 0; | |
347 | err_del_interface: | |
348 | drv_remove_interface(local, &sdata->vif); | |
349 | err_stop: | |
350 | if (!local->open_count) | |
351 | drv_stop(local); | |
352 | err_del_bss: | |
353 | sdata->bss = NULL; | |
354 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
355 | list_del(&sdata->u.vlan.list); | |
356 | clear_bit(SDATA_STATE_RUNNING, &sdata->state); | |
357 | return res; | |
358 | } | |
359 | ||
360 | static int ieee80211_open(struct net_device *dev) | |
361 | { | |
362 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
363 | int err; | |
364 | ||
365 | /* fail early if user set an invalid address */ | |
366 | if (!is_valid_ether_addr(dev->dev_addr)) | |
367 | return -EADDRNOTAVAIL; | |
368 | ||
369 | err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); | |
370 | if (err) | |
371 | return err; | |
372 | ||
373 | return ieee80211_do_open(dev, true); | |
374 | } | |
375 | ||
376 | static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, | |
377 | bool going_down) | |
378 | { | |
379 | struct ieee80211_local *local = sdata->local; | |
380 | unsigned long flags; | |
381 | struct sk_buff *skb, *tmp; | |
382 | u32 hw_reconf_flags = 0; | |
383 | int i; | |
384 | enum nl80211_channel_type orig_ct; | |
385 | ||
386 | clear_bit(SDATA_STATE_RUNNING, &sdata->state); | |
387 | ||
388 | if (local->scan_sdata == sdata) | |
389 | ieee80211_scan_cancel(local); | |
390 | ||
391 | /* | |
392 | * Stop TX on this interface first. | |
393 | */ | |
394 | netif_tx_stop_all_queues(sdata->dev); | |
395 | ||
396 | /* | |
397 | * Purge work for this interface. | |
398 | */ | |
399 | ieee80211_work_purge(sdata); | |
400 | ||
401 | /* | |
402 | * Remove all stations associated with this interface. | |
403 | * | |
404 | * This must be done before calling ops->remove_interface() | |
405 | * because otherwise we can later invoke ops->sta_notify() | |
406 | * whenever the STAs are removed, and that invalidates driver | |
407 | * assumptions about always getting a vif pointer that is valid | |
408 | * (because if we remove a STA after ops->remove_interface() | |
409 | * the driver will have removed the vif info already!) | |
410 | * | |
411 | * This is relevant only in AP, WDS and mesh modes, since in | |
412 | * all other modes we've already removed all stations when | |
413 | * disconnecting etc. | |
414 | */ | |
415 | sta_info_flush(local, sdata); | |
416 | ||
417 | /* | |
418 | * Don't count this interface for promisc/allmulti while it | |
419 | * is down. dev_mc_unsync() will invoke set_multicast_list | |
420 | * on the master interface which will sync these down to the | |
421 | * hardware as filter flags. | |
422 | */ | |
423 | if (sdata->flags & IEEE80211_SDATA_ALLMULTI) | |
424 | atomic_dec(&local->iff_allmultis); | |
425 | ||
426 | if (sdata->flags & IEEE80211_SDATA_PROMISC) | |
427 | atomic_dec(&local->iff_promiscs); | |
428 | ||
429 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
430 | local->fif_pspoll--; | |
431 | local->fif_probe_req--; | |
432 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
433 | local->fif_probe_req--; | |
434 | } | |
435 | ||
436 | netif_addr_lock_bh(sdata->dev); | |
437 | spin_lock_bh(&local->filter_lock); | |
438 | __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, | |
439 | sdata->dev->addr_len); | |
440 | spin_unlock_bh(&local->filter_lock); | |
441 | netif_addr_unlock_bh(sdata->dev); | |
442 | ||
443 | ieee80211_configure_filter(local); | |
444 | ||
445 | del_timer_sync(&local->dynamic_ps_timer); | |
446 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
447 | ||
448 | /* APs need special treatment */ | |
449 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
450 | struct ieee80211_sub_if_data *vlan, *tmpsdata; | |
451 | struct beacon_data *old_beacon = | |
452 | rtnl_dereference(sdata->u.ap.beacon); | |
453 | ||
454 | /* sdata_running will return false, so this will disable */ | |
455 | ieee80211_bss_info_change_notify(sdata, | |
456 | BSS_CHANGED_BEACON_ENABLED); | |
457 | ||
458 | /* remove beacon */ | |
459 | RCU_INIT_POINTER(sdata->u.ap.beacon, NULL); | |
460 | synchronize_rcu(); | |
461 | kfree(old_beacon); | |
462 | ||
463 | /* down all dependent devices, that is VLANs */ | |
464 | list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, | |
465 | u.vlan.list) | |
466 | dev_close(vlan->dev); | |
467 | WARN_ON(!list_empty(&sdata->u.ap.vlans)); | |
468 | ||
469 | /* free all potentially still buffered bcast frames */ | |
470 | local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf); | |
471 | skb_queue_purge(&sdata->u.ap.ps_bc_buf); | |
472 | } | |
473 | ||
474 | if (going_down) | |
475 | local->open_count--; | |
476 | ||
477 | switch (sdata->vif.type) { | |
478 | case NL80211_IFTYPE_AP_VLAN: | |
479 | list_del(&sdata->u.vlan.list); | |
480 | /* no need to tell driver */ | |
481 | break; | |
482 | case NL80211_IFTYPE_MONITOR: | |
483 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { | |
484 | local->cooked_mntrs--; | |
485 | break; | |
486 | } | |
487 | ||
488 | local->monitors--; | |
489 | if (local->monitors == 0) { | |
490 | local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; | |
491 | hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; | |
492 | } | |
493 | ||
494 | ieee80211_adjust_monitor_flags(sdata, -1); | |
495 | ieee80211_configure_filter(local); | |
496 | break; | |
497 | default: | |
498 | flush_work(&sdata->work); | |
499 | /* | |
500 | * When we get here, the interface is marked down. | |
501 | * Call synchronize_rcu() to wait for the RX path | |
502 | * should it be using the interface and enqueuing | |
503 | * frames at this very time on another CPU. | |
504 | */ | |
505 | synchronize_rcu(); | |
506 | skb_queue_purge(&sdata->skb_queue); | |
507 | ||
508 | /* | |
509 | * Disable beaconing here for mesh only, AP and IBSS | |
510 | * are already taken care of. | |
511 | */ | |
512 | if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
513 | ieee80211_bss_info_change_notify(sdata, | |
514 | BSS_CHANGED_BEACON_ENABLED); | |
515 | ||
516 | /* | |
517 | * Free all remaining keys, there shouldn't be any, | |
518 | * except maybe group keys in AP more or WDS? | |
519 | */ | |
520 | ieee80211_free_keys(sdata); | |
521 | ||
522 | if (going_down) | |
523 | drv_remove_interface(local, &sdata->vif); | |
524 | } | |
525 | ||
526 | sdata->bss = NULL; | |
527 | ||
528 | mutex_lock(&local->mtx); | |
529 | hw_reconf_flags |= __ieee80211_recalc_idle(local); | |
530 | mutex_unlock(&local->mtx); | |
531 | ||
532 | ieee80211_recalc_ps(local, -1); | |
533 | ||
534 | if (local->open_count == 0) { | |
535 | if (local->ops->napi_poll) | |
536 | napi_disable(&local->napi); | |
537 | ieee80211_clear_tx_pending(local); | |
538 | ieee80211_stop_device(local); | |
539 | ||
540 | /* no reconfiguring after stop! */ | |
541 | hw_reconf_flags = 0; | |
542 | } | |
543 | ||
544 | /* Re-calculate channel-type, in case there are multiple vifs | |
545 | * on different channel types. | |
546 | */ | |
547 | orig_ct = local->_oper_channel_type; | |
548 | ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT); | |
549 | ||
550 | /* do after stop to avoid reconfiguring when we stop anyway */ | |
551 | if (hw_reconf_flags || (orig_ct != local->_oper_channel_type)) | |
552 | ieee80211_hw_config(local, hw_reconf_flags); | |
553 | ||
554 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
555 | for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { | |
556 | skb_queue_walk_safe(&local->pending[i], skb, tmp) { | |
557 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
558 | if (info->control.vif == &sdata->vif) { | |
559 | __skb_unlink(skb, &local->pending[i]); | |
560 | dev_kfree_skb_irq(skb); | |
561 | } | |
562 | } | |
563 | } | |
564 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
565 | } | |
566 | ||
567 | static int ieee80211_stop(struct net_device *dev) | |
568 | { | |
569 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
570 | ||
571 | ieee80211_do_stop(sdata, true); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | static void ieee80211_set_multicast_list(struct net_device *dev) | |
577 | { | |
578 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
579 | struct ieee80211_local *local = sdata->local; | |
580 | int allmulti, promisc, sdata_allmulti, sdata_promisc; | |
581 | ||
582 | allmulti = !!(dev->flags & IFF_ALLMULTI); | |
583 | promisc = !!(dev->flags & IFF_PROMISC); | |
584 | sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); | |
585 | sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); | |
586 | ||
587 | if (allmulti != sdata_allmulti) { | |
588 | if (dev->flags & IFF_ALLMULTI) | |
589 | atomic_inc(&local->iff_allmultis); | |
590 | else | |
591 | atomic_dec(&local->iff_allmultis); | |
592 | sdata->flags ^= IEEE80211_SDATA_ALLMULTI; | |
593 | } | |
594 | ||
595 | if (promisc != sdata_promisc) { | |
596 | if (dev->flags & IFF_PROMISC) | |
597 | atomic_inc(&local->iff_promiscs); | |
598 | else | |
599 | atomic_dec(&local->iff_promiscs); | |
600 | sdata->flags ^= IEEE80211_SDATA_PROMISC; | |
601 | } | |
602 | spin_lock_bh(&local->filter_lock); | |
603 | __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); | |
604 | spin_unlock_bh(&local->filter_lock); | |
605 | ieee80211_queue_work(&local->hw, &local->reconfig_filter); | |
606 | } | |
607 | ||
608 | /* | |
609 | * Called when the netdev is removed or, by the code below, before | |
610 | * the interface type changes. | |
611 | */ | |
612 | static void ieee80211_teardown_sdata(struct net_device *dev) | |
613 | { | |
614 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
615 | struct ieee80211_local *local = sdata->local; | |
616 | int flushed; | |
617 | int i; | |
618 | ||
619 | /* free extra data */ | |
620 | ieee80211_free_keys(sdata); | |
621 | ||
622 | ieee80211_debugfs_remove_netdev(sdata); | |
623 | ||
624 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) | |
625 | __skb_queue_purge(&sdata->fragments[i].skb_list); | |
626 | sdata->fragment_next = 0; | |
627 | ||
628 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
629 | mesh_rmc_free(sdata); | |
630 | ||
631 | flushed = sta_info_flush(local, sdata); | |
632 | WARN_ON(flushed); | |
633 | } | |
634 | ||
635 | static u16 ieee80211_netdev_select_queue(struct net_device *dev, | |
636 | struct sk_buff *skb) | |
637 | { | |
638 | return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); | |
639 | } | |
640 | ||
641 | static const struct net_device_ops ieee80211_dataif_ops = { | |
642 | .ndo_open = ieee80211_open, | |
643 | .ndo_stop = ieee80211_stop, | |
644 | .ndo_uninit = ieee80211_teardown_sdata, | |
645 | .ndo_start_xmit = ieee80211_subif_start_xmit, | |
646 | .ndo_set_rx_mode = ieee80211_set_multicast_list, | |
647 | .ndo_change_mtu = ieee80211_change_mtu, | |
648 | .ndo_set_mac_address = ieee80211_change_mac, | |
649 | .ndo_select_queue = ieee80211_netdev_select_queue, | |
650 | }; | |
651 | ||
652 | static u16 ieee80211_monitor_select_queue(struct net_device *dev, | |
653 | struct sk_buff *skb) | |
654 | { | |
655 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
656 | struct ieee80211_local *local = sdata->local; | |
657 | struct ieee80211_hdr *hdr; | |
658 | struct ieee80211_radiotap_header *rtap = (void *)skb->data; | |
659 | u8 *p; | |
660 | ||
661 | if (local->hw.queues < 4) | |
662 | return 0; | |
663 | ||
664 | if (skb->len < 4 || | |
665 | skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) | |
666 | return 0; /* doesn't matter, frame will be dropped */ | |
667 | ||
668 | hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); | |
669 | ||
670 | if (!ieee80211_is_data(hdr->frame_control)) { | |
671 | skb->priority = 7; | |
672 | return ieee802_1d_to_ac[skb->priority]; | |
673 | } | |
674 | if (!ieee80211_is_data_qos(hdr->frame_control)) { | |
675 | skb->priority = 0; | |
676 | return ieee802_1d_to_ac[skb->priority]; | |
677 | } | |
678 | ||
679 | p = ieee80211_get_qos_ctl(hdr); | |
680 | skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; | |
681 | ||
682 | return ieee80211_downgrade_queue(local, skb); | |
683 | } | |
684 | ||
685 | static const struct net_device_ops ieee80211_monitorif_ops = { | |
686 | .ndo_open = ieee80211_open, | |
687 | .ndo_stop = ieee80211_stop, | |
688 | .ndo_uninit = ieee80211_teardown_sdata, | |
689 | .ndo_start_xmit = ieee80211_monitor_start_xmit, | |
690 | .ndo_set_rx_mode = ieee80211_set_multicast_list, | |
691 | .ndo_change_mtu = ieee80211_change_mtu, | |
692 | .ndo_set_mac_address = eth_mac_addr, | |
693 | .ndo_select_queue = ieee80211_monitor_select_queue, | |
694 | }; | |
695 | ||
696 | static void ieee80211_if_setup(struct net_device *dev) | |
697 | { | |
698 | ether_setup(dev); | |
699 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
700 | dev->netdev_ops = &ieee80211_dataif_ops; | |
701 | dev->destructor = free_netdev; | |
702 | } | |
703 | ||
704 | static void ieee80211_iface_work(struct work_struct *work) | |
705 | { | |
706 | struct ieee80211_sub_if_data *sdata = | |
707 | container_of(work, struct ieee80211_sub_if_data, work); | |
708 | struct ieee80211_local *local = sdata->local; | |
709 | struct sk_buff *skb; | |
710 | struct sta_info *sta; | |
711 | struct ieee80211_ra_tid *ra_tid; | |
712 | ||
713 | if (!ieee80211_sdata_running(sdata)) | |
714 | return; | |
715 | ||
716 | if (local->scanning) | |
717 | return; | |
718 | ||
719 | /* | |
720 | * ieee80211_queue_work() should have picked up most cases, | |
721 | * here we'll pick the rest. | |
722 | */ | |
723 | if (WARN(local->suspended, | |
724 | "interface work scheduled while going to suspend\n")) | |
725 | return; | |
726 | ||
727 | /* first process frames */ | |
728 | while ((skb = skb_dequeue(&sdata->skb_queue))) { | |
729 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
730 | ||
731 | if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { | |
732 | ra_tid = (void *)&skb->cb; | |
733 | ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, | |
734 | ra_tid->tid); | |
735 | } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { | |
736 | ra_tid = (void *)&skb->cb; | |
737 | ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, | |
738 | ra_tid->tid); | |
739 | } else if (ieee80211_is_action(mgmt->frame_control) && | |
740 | mgmt->u.action.category == WLAN_CATEGORY_BACK) { | |
741 | int len = skb->len; | |
742 | ||
743 | mutex_lock(&local->sta_mtx); | |
744 | sta = sta_info_get_bss(sdata, mgmt->sa); | |
745 | if (sta) { | |
746 | switch (mgmt->u.action.u.addba_req.action_code) { | |
747 | case WLAN_ACTION_ADDBA_REQ: | |
748 | ieee80211_process_addba_request( | |
749 | local, sta, mgmt, len); | |
750 | break; | |
751 | case WLAN_ACTION_ADDBA_RESP: | |
752 | ieee80211_process_addba_resp(local, sta, | |
753 | mgmt, len); | |
754 | break; | |
755 | case WLAN_ACTION_DELBA: | |
756 | ieee80211_process_delba(sdata, sta, | |
757 | mgmt, len); | |
758 | break; | |
759 | default: | |
760 | WARN_ON(1); | |
761 | break; | |
762 | } | |
763 | } | |
764 | mutex_unlock(&local->sta_mtx); | |
765 | } else if (ieee80211_is_data_qos(mgmt->frame_control)) { | |
766 | struct ieee80211_hdr *hdr = (void *)mgmt; | |
767 | /* | |
768 | * So the frame isn't mgmt, but frame_control | |
769 | * is at the right place anyway, of course, so | |
770 | * the if statement is correct. | |
771 | * | |
772 | * Warn if we have other data frame types here, | |
773 | * they must not get here. | |
774 | */ | |
775 | WARN_ON(hdr->frame_control & | |
776 | cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); | |
777 | WARN_ON(!(hdr->seq_ctrl & | |
778 | cpu_to_le16(IEEE80211_SCTL_FRAG))); | |
779 | /* | |
780 | * This was a fragment of a frame, received while | |
781 | * a block-ack session was active. That cannot be | |
782 | * right, so terminate the session. | |
783 | */ | |
784 | mutex_lock(&local->sta_mtx); | |
785 | sta = sta_info_get_bss(sdata, mgmt->sa); | |
786 | if (sta) { | |
787 | u16 tid = *ieee80211_get_qos_ctl(hdr) & | |
788 | IEEE80211_QOS_CTL_TID_MASK; | |
789 | ||
790 | __ieee80211_stop_rx_ba_session( | |
791 | sta, tid, WLAN_BACK_RECIPIENT, | |
792 | WLAN_REASON_QSTA_REQUIRE_SETUP, | |
793 | true); | |
794 | } | |
795 | mutex_unlock(&local->sta_mtx); | |
796 | } else switch (sdata->vif.type) { | |
797 | case NL80211_IFTYPE_STATION: | |
798 | ieee80211_sta_rx_queued_mgmt(sdata, skb); | |
799 | break; | |
800 | case NL80211_IFTYPE_ADHOC: | |
801 | ieee80211_ibss_rx_queued_mgmt(sdata, skb); | |
802 | break; | |
803 | case NL80211_IFTYPE_MESH_POINT: | |
804 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
805 | break; | |
806 | ieee80211_mesh_rx_queued_mgmt(sdata, skb); | |
807 | break; | |
808 | default: | |
809 | WARN(1, "frame for unexpected interface type"); | |
810 | break; | |
811 | } | |
812 | ||
813 | kfree_skb(skb); | |
814 | } | |
815 | ||
816 | /* then other type-dependent work */ | |
817 | switch (sdata->vif.type) { | |
818 | case NL80211_IFTYPE_STATION: | |
819 | ieee80211_sta_work(sdata); | |
820 | break; | |
821 | case NL80211_IFTYPE_ADHOC: | |
822 | ieee80211_ibss_work(sdata); | |
823 | break; | |
824 | case NL80211_IFTYPE_MESH_POINT: | |
825 | if (!ieee80211_vif_is_mesh(&sdata->vif)) | |
826 | break; | |
827 | ieee80211_mesh_work(sdata); | |
828 | break; | |
829 | default: | |
830 | break; | |
831 | } | |
832 | } | |
833 | ||
834 | ||
835 | /* | |
836 | * Helper function to initialise an interface to a specific type. | |
837 | */ | |
838 | static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, | |
839 | enum nl80211_iftype type) | |
840 | { | |
841 | /* clear type-dependent union */ | |
842 | memset(&sdata->u, 0, sizeof(sdata->u)); | |
843 | ||
844 | /* and set some type-dependent values */ | |
845 | sdata->vif.type = type; | |
846 | sdata->vif.p2p = false; | |
847 | sdata->dev->netdev_ops = &ieee80211_dataif_ops; | |
848 | sdata->wdev.iftype = type; | |
849 | ||
850 | sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); | |
851 | sdata->control_port_no_encrypt = false; | |
852 | ||
853 | /* only monitor differs */ | |
854 | sdata->dev->type = ARPHRD_ETHER; | |
855 | ||
856 | skb_queue_head_init(&sdata->skb_queue); | |
857 | INIT_WORK(&sdata->work, ieee80211_iface_work); | |
858 | ||
859 | switch (type) { | |
860 | case NL80211_IFTYPE_P2P_GO: | |
861 | type = NL80211_IFTYPE_AP; | |
862 | sdata->vif.type = type; | |
863 | sdata->vif.p2p = true; | |
864 | /* fall through */ | |
865 | case NL80211_IFTYPE_AP: | |
866 | skb_queue_head_init(&sdata->u.ap.ps_bc_buf); | |
867 | INIT_LIST_HEAD(&sdata->u.ap.vlans); | |
868 | break; | |
869 | case NL80211_IFTYPE_P2P_CLIENT: | |
870 | type = NL80211_IFTYPE_STATION; | |
871 | sdata->vif.type = type; | |
872 | sdata->vif.p2p = true; | |
873 | /* fall through */ | |
874 | case NL80211_IFTYPE_STATION: | |
875 | ieee80211_sta_setup_sdata(sdata); | |
876 | break; | |
877 | case NL80211_IFTYPE_ADHOC: | |
878 | ieee80211_ibss_setup_sdata(sdata); | |
879 | break; | |
880 | case NL80211_IFTYPE_MESH_POINT: | |
881 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
882 | ieee80211_mesh_init_sdata(sdata); | |
883 | break; | |
884 | case NL80211_IFTYPE_MONITOR: | |
885 | sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; | |
886 | sdata->dev->netdev_ops = &ieee80211_monitorif_ops; | |
887 | sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | | |
888 | MONITOR_FLAG_OTHER_BSS; | |
889 | break; | |
890 | case NL80211_IFTYPE_WDS: | |
891 | case NL80211_IFTYPE_AP_VLAN: | |
892 | break; | |
893 | case NL80211_IFTYPE_UNSPECIFIED: | |
894 | case NUM_NL80211_IFTYPES: | |
895 | BUG(); | |
896 | break; | |
897 | } | |
898 | ||
899 | ieee80211_debugfs_add_netdev(sdata); | |
900 | } | |
901 | ||
902 | static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, | |
903 | enum nl80211_iftype type) | |
904 | { | |
905 | struct ieee80211_local *local = sdata->local; | |
906 | int ret, err; | |
907 | enum nl80211_iftype internal_type = type; | |
908 | bool p2p = false; | |
909 | ||
910 | ASSERT_RTNL(); | |
911 | ||
912 | if (!local->ops->change_interface) | |
913 | return -EBUSY; | |
914 | ||
915 | switch (sdata->vif.type) { | |
916 | case NL80211_IFTYPE_AP: | |
917 | case NL80211_IFTYPE_STATION: | |
918 | case NL80211_IFTYPE_ADHOC: | |
919 | /* | |
920 | * Could maybe also all others here? | |
921 | * Just not sure how that interacts | |
922 | * with the RX/config path e.g. for | |
923 | * mesh. | |
924 | */ | |
925 | break; | |
926 | default: | |
927 | return -EBUSY; | |
928 | } | |
929 | ||
930 | switch (type) { | |
931 | case NL80211_IFTYPE_AP: | |
932 | case NL80211_IFTYPE_STATION: | |
933 | case NL80211_IFTYPE_ADHOC: | |
934 | /* | |
935 | * Could probably support everything | |
936 | * but WDS here (WDS do_open can fail | |
937 | * under memory pressure, which this | |
938 | * code isn't prepared to handle). | |
939 | */ | |
940 | break; | |
941 | case NL80211_IFTYPE_P2P_CLIENT: | |
942 | p2p = true; | |
943 | internal_type = NL80211_IFTYPE_STATION; | |
944 | break; | |
945 | case NL80211_IFTYPE_P2P_GO: | |
946 | p2p = true; | |
947 | internal_type = NL80211_IFTYPE_AP; | |
948 | break; | |
949 | default: | |
950 | return -EBUSY; | |
951 | } | |
952 | ||
953 | ret = ieee80211_check_concurrent_iface(sdata, internal_type); | |
954 | if (ret) | |
955 | return ret; | |
956 | ||
957 | ieee80211_do_stop(sdata, false); | |
958 | ||
959 | ieee80211_teardown_sdata(sdata->dev); | |
960 | ||
961 | ret = drv_change_interface(local, sdata, internal_type, p2p); | |
962 | if (ret) | |
963 | type = sdata->vif.type; | |
964 | ||
965 | ieee80211_setup_sdata(sdata, type); | |
966 | ||
967 | err = ieee80211_do_open(sdata->dev, false); | |
968 | WARN(err, "type change: do_open returned %d", err); | |
969 | ||
970 | return ret; | |
971 | } | |
972 | ||
973 | int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, | |
974 | enum nl80211_iftype type) | |
975 | { | |
976 | int ret; | |
977 | ||
978 | ASSERT_RTNL(); | |
979 | ||
980 | if (type == ieee80211_vif_type_p2p(&sdata->vif)) | |
981 | return 0; | |
982 | ||
983 | /* Setting ad-hoc mode on non-IBSS channel is not supported. */ | |
984 | if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && | |
985 | type == NL80211_IFTYPE_ADHOC) | |
986 | return -EOPNOTSUPP; | |
987 | ||
988 | if (ieee80211_sdata_running(sdata)) { | |
989 | ret = ieee80211_runtime_change_iftype(sdata, type); | |
990 | if (ret) | |
991 | return ret; | |
992 | } else { | |
993 | /* Purge and reset type-dependent state. */ | |
994 | ieee80211_teardown_sdata(sdata->dev); | |
995 | ieee80211_setup_sdata(sdata, type); | |
996 | } | |
997 | ||
998 | /* reset some values that shouldn't be kept across type changes */ | |
999 | sdata->vif.bss_conf.basic_rates = | |
1000 | ieee80211_mandatory_rates(sdata->local, | |
1001 | sdata->local->hw.conf.channel->band); | |
1002 | sdata->drop_unencrypted = 0; | |
1003 | if (type == NL80211_IFTYPE_STATION) | |
1004 | sdata->u.mgd.use_4addr = false; | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static void ieee80211_assign_perm_addr(struct ieee80211_local *local, | |
1010 | struct net_device *dev, | |
1011 | enum nl80211_iftype type) | |
1012 | { | |
1013 | struct ieee80211_sub_if_data *sdata; | |
1014 | u64 mask, start, addr, val, inc; | |
1015 | u8 *m; | |
1016 | u8 tmp_addr[ETH_ALEN]; | |
1017 | int i; | |
1018 | ||
1019 | /* default ... something at least */ | |
1020 | memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); | |
1021 | ||
1022 | if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && | |
1023 | local->hw.wiphy->n_addresses <= 1) | |
1024 | return; | |
1025 | ||
1026 | ||
1027 | mutex_lock(&local->iflist_mtx); | |
1028 | ||
1029 | switch (type) { | |
1030 | case NL80211_IFTYPE_MONITOR: | |
1031 | /* doesn't matter */ | |
1032 | break; | |
1033 | case NL80211_IFTYPE_WDS: | |
1034 | case NL80211_IFTYPE_AP_VLAN: | |
1035 | /* match up with an AP interface */ | |
1036 | list_for_each_entry(sdata, &local->interfaces, list) { | |
1037 | if (sdata->vif.type != NL80211_IFTYPE_AP) | |
1038 | continue; | |
1039 | memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN); | |
1040 | break; | |
1041 | } | |
1042 | /* keep default if no AP interface present */ | |
1043 | break; | |
1044 | default: | |
1045 | /* assign a new address if possible -- try n_addresses first */ | |
1046 | for (i = 0; i < local->hw.wiphy->n_addresses; i++) { | |
1047 | bool used = false; | |
1048 | ||
1049 | list_for_each_entry(sdata, &local->interfaces, list) { | |
1050 | if (memcmp(local->hw.wiphy->addresses[i].addr, | |
1051 | sdata->vif.addr, ETH_ALEN) == 0) { | |
1052 | used = true; | |
1053 | break; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | if (!used) { | |
1058 | memcpy(dev->perm_addr, | |
1059 | local->hw.wiphy->addresses[i].addr, | |
1060 | ETH_ALEN); | |
1061 | break; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | /* try mask if available */ | |
1066 | if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) | |
1067 | break; | |
1068 | ||
1069 | m = local->hw.wiphy->addr_mask; | |
1070 | mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | | |
1071 | ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | | |
1072 | ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); | |
1073 | ||
1074 | if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { | |
1075 | /* not a contiguous mask ... not handled now! */ | |
1076 | printk(KERN_DEBUG "not contiguous\n"); | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | m = local->hw.wiphy->perm_addr; | |
1081 | start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | | |
1082 | ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | | |
1083 | ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); | |
1084 | ||
1085 | inc = 1ULL<<__ffs64(mask); | |
1086 | val = (start & mask); | |
1087 | addr = (start & ~mask) | (val & mask); | |
1088 | do { | |
1089 | bool used = false; | |
1090 | ||
1091 | tmp_addr[5] = addr >> 0*8; | |
1092 | tmp_addr[4] = addr >> 1*8; | |
1093 | tmp_addr[3] = addr >> 2*8; | |
1094 | tmp_addr[2] = addr >> 3*8; | |
1095 | tmp_addr[1] = addr >> 4*8; | |
1096 | tmp_addr[0] = addr >> 5*8; | |
1097 | ||
1098 | val += inc; | |
1099 | ||
1100 | list_for_each_entry(sdata, &local->interfaces, list) { | |
1101 | if (memcmp(tmp_addr, sdata->vif.addr, | |
1102 | ETH_ALEN) == 0) { | |
1103 | used = true; | |
1104 | break; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | if (!used) { | |
1109 | memcpy(dev->perm_addr, tmp_addr, ETH_ALEN); | |
1110 | break; | |
1111 | } | |
1112 | addr = (start & ~mask) | (val & mask); | |
1113 | } while (addr != start); | |
1114 | ||
1115 | break; | |
1116 | } | |
1117 | ||
1118 | mutex_unlock(&local->iflist_mtx); | |
1119 | } | |
1120 | ||
1121 | int ieee80211_if_add(struct ieee80211_local *local, const char *name, | |
1122 | struct net_device **new_dev, enum nl80211_iftype type, | |
1123 | struct vif_params *params) | |
1124 | { | |
1125 | struct net_device *ndev; | |
1126 | struct ieee80211_sub_if_data *sdata = NULL; | |
1127 | int ret, i; | |
1128 | ||
1129 | ASSERT_RTNL(); | |
1130 | ||
1131 | ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size, | |
1132 | name, ieee80211_if_setup, local->hw.queues, 1); | |
1133 | if (!ndev) | |
1134 | return -ENOMEM; | |
1135 | dev_net_set(ndev, wiphy_net(local->hw.wiphy)); | |
1136 | ||
1137 | ndev->needed_headroom = local->tx_headroom + | |
1138 | 4*6 /* four MAC addresses */ | |
1139 | + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ | |
1140 | + 6 /* mesh */ | |
1141 | + 8 /* rfc1042/bridge tunnel */ | |
1142 | - ETH_HLEN /* ethernet hard_header_len */ | |
1143 | + IEEE80211_ENCRYPT_HEADROOM; | |
1144 | ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; | |
1145 | ||
1146 | ret = dev_alloc_name(ndev, ndev->name); | |
1147 | if (ret < 0) | |
1148 | goto fail; | |
1149 | ||
1150 | ieee80211_assign_perm_addr(local, ndev, type); | |
1151 | memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); | |
1152 | SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); | |
1153 | ||
1154 | /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ | |
1155 | sdata = netdev_priv(ndev); | |
1156 | ndev->ieee80211_ptr = &sdata->wdev; | |
1157 | memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); | |
1158 | memcpy(sdata->name, ndev->name, IFNAMSIZ); | |
1159 | ||
1160 | /* initialise type-independent data */ | |
1161 | sdata->wdev.wiphy = local->hw.wiphy; | |
1162 | sdata->local = local; | |
1163 | sdata->dev = ndev; | |
1164 | #ifdef CONFIG_INET | |
1165 | sdata->arp_filter_state = true; | |
1166 | #endif | |
1167 | ||
1168 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) | |
1169 | skb_queue_head_init(&sdata->fragments[i].skb_list); | |
1170 | ||
1171 | INIT_LIST_HEAD(&sdata->key_list); | |
1172 | ||
1173 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
1174 | struct ieee80211_supported_band *sband; | |
1175 | sband = local->hw.wiphy->bands[i]; | |
1176 | sdata->rc_rateidx_mask[i] = | |
1177 | sband ? (1 << sband->n_bitrates) - 1 : 0; | |
1178 | } | |
1179 | ||
1180 | /* setup type-dependent data */ | |
1181 | ieee80211_setup_sdata(sdata, type); | |
1182 | ||
1183 | if (params) { | |
1184 | ndev->ieee80211_ptr->use_4addr = params->use_4addr; | |
1185 | if (type == NL80211_IFTYPE_STATION) | |
1186 | sdata->u.mgd.use_4addr = params->use_4addr; | |
1187 | } | |
1188 | ||
1189 | ret = register_netdevice(ndev); | |
1190 | if (ret) | |
1191 | goto fail; | |
1192 | ||
1193 | mutex_lock(&local->iflist_mtx); | |
1194 | list_add_tail_rcu(&sdata->list, &local->interfaces); | |
1195 | mutex_unlock(&local->iflist_mtx); | |
1196 | ||
1197 | if (new_dev) | |
1198 | *new_dev = ndev; | |
1199 | ||
1200 | return 0; | |
1201 | ||
1202 | fail: | |
1203 | free_netdev(ndev); | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) | |
1208 | { | |
1209 | ASSERT_RTNL(); | |
1210 | ||
1211 | mutex_lock(&sdata->local->iflist_mtx); | |
1212 | list_del_rcu(&sdata->list); | |
1213 | mutex_unlock(&sdata->local->iflist_mtx); | |
1214 | ||
1215 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
1216 | mesh_path_flush_by_iface(sdata); | |
1217 | ||
1218 | synchronize_rcu(); | |
1219 | unregister_netdevice(sdata->dev); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Remove all interfaces, may only be called at hardware unregistration | |
1224 | * time because it doesn't do RCU-safe list removals. | |
1225 | */ | |
1226 | void ieee80211_remove_interfaces(struct ieee80211_local *local) | |
1227 | { | |
1228 | struct ieee80211_sub_if_data *sdata, *tmp; | |
1229 | LIST_HEAD(unreg_list); | |
1230 | ||
1231 | ASSERT_RTNL(); | |
1232 | ||
1233 | mutex_lock(&local->iflist_mtx); | |
1234 | list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { | |
1235 | list_del(&sdata->list); | |
1236 | ||
1237 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
1238 | mesh_path_flush_by_iface(sdata); | |
1239 | ||
1240 | unregister_netdevice_queue(sdata->dev, &unreg_list); | |
1241 | } | |
1242 | mutex_unlock(&local->iflist_mtx); | |
1243 | unregister_netdevice_many(&unreg_list); | |
1244 | list_del(&unreg_list); | |
1245 | } | |
1246 | ||
1247 | static u32 ieee80211_idle_off(struct ieee80211_local *local, | |
1248 | const char *reason) | |
1249 | { | |
1250 | if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) | |
1251 | return 0; | |
1252 | ||
1253 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1254 | wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason); | |
1255 | #endif | |
1256 | ||
1257 | local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; | |
1258 | return IEEE80211_CONF_CHANGE_IDLE; | |
1259 | } | |
1260 | ||
1261 | static u32 ieee80211_idle_on(struct ieee80211_local *local) | |
1262 | { | |
1263 | if (local->hw.conf.flags & IEEE80211_CONF_IDLE) | |
1264 | return 0; | |
1265 | ||
1266 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1267 | wiphy_debug(local->hw.wiphy, "device now idle\n"); | |
1268 | #endif | |
1269 | ||
1270 | drv_flush(local, false); | |
1271 | ||
1272 | local->hw.conf.flags |= IEEE80211_CONF_IDLE; | |
1273 | return IEEE80211_CONF_CHANGE_IDLE; | |
1274 | } | |
1275 | ||
1276 | u32 __ieee80211_recalc_idle(struct ieee80211_local *local) | |
1277 | { | |
1278 | struct ieee80211_sub_if_data *sdata; | |
1279 | int count = 0; | |
1280 | bool working = false, scanning = false, hw_roc = false; | |
1281 | struct ieee80211_work *wk; | |
1282 | unsigned int led_trig_start = 0, led_trig_stop = 0; | |
1283 | ||
1284 | #ifdef CONFIG_PROVE_LOCKING | |
1285 | WARN_ON(debug_locks && !lockdep_rtnl_is_held() && | |
1286 | !lockdep_is_held(&local->iflist_mtx)); | |
1287 | #endif | |
1288 | lockdep_assert_held(&local->mtx); | |
1289 | ||
1290 | list_for_each_entry(sdata, &local->interfaces, list) { | |
1291 | if (!ieee80211_sdata_running(sdata)) { | |
1292 | sdata->vif.bss_conf.idle = true; | |
1293 | continue; | |
1294 | } | |
1295 | ||
1296 | sdata->old_idle = sdata->vif.bss_conf.idle; | |
1297 | ||
1298 | /* do not count disabled managed interfaces */ | |
1299 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
1300 | !sdata->u.mgd.associated) { | |
1301 | sdata->vif.bss_conf.idle = true; | |
1302 | continue; | |
1303 | } | |
1304 | /* do not count unused IBSS interfaces */ | |
1305 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
1306 | !sdata->u.ibss.ssid_len) { | |
1307 | sdata->vif.bss_conf.idle = true; | |
1308 | continue; | |
1309 | } | |
1310 | /* count everything else */ | |
1311 | count++; | |
1312 | } | |
1313 | ||
1314 | list_for_each_entry(wk, &local->work_list, list) { | |
1315 | working = true; | |
1316 | wk->sdata->vif.bss_conf.idle = false; | |
1317 | } | |
1318 | ||
1319 | if (local->scan_sdata) { | |
1320 | scanning = true; | |
1321 | local->scan_sdata->vif.bss_conf.idle = false; | |
1322 | } | |
1323 | ||
1324 | if (local->hw_roc_channel) | |
1325 | hw_roc = true; | |
1326 | ||
1327 | list_for_each_entry(sdata, &local->interfaces, list) { | |
1328 | if (sdata->old_idle == sdata->vif.bss_conf.idle) | |
1329 | continue; | |
1330 | if (!ieee80211_sdata_running(sdata)) | |
1331 | continue; | |
1332 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); | |
1333 | } | |
1334 | ||
1335 | if (working || scanning || hw_roc) | |
1336 | led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; | |
1337 | else | |
1338 | led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; | |
1339 | ||
1340 | if (count) | |
1341 | led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; | |
1342 | else | |
1343 | led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; | |
1344 | ||
1345 | ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); | |
1346 | ||
1347 | if (hw_roc) | |
1348 | return ieee80211_idle_off(local, "hw remain-on-channel"); | |
1349 | if (working) | |
1350 | return ieee80211_idle_off(local, "working"); | |
1351 | if (scanning) | |
1352 | return ieee80211_idle_off(local, "scanning"); | |
1353 | if (!count) | |
1354 | return ieee80211_idle_on(local); | |
1355 | else | |
1356 | return ieee80211_idle_off(local, "in use"); | |
1357 | ||
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | void ieee80211_recalc_idle(struct ieee80211_local *local) | |
1362 | { | |
1363 | u32 chg; | |
1364 | ||
1365 | mutex_lock(&local->iflist_mtx); | |
1366 | chg = __ieee80211_recalc_idle(local); | |
1367 | mutex_unlock(&local->iflist_mtx); | |
1368 | if (chg) | |
1369 | ieee80211_hw_config(local, chg); | |
1370 | } | |
1371 | ||
1372 | static int netdev_notify(struct notifier_block *nb, | |
1373 | unsigned long state, | |
1374 | void *ndev) | |
1375 | { | |
1376 | struct net_device *dev = ndev; | |
1377 | struct ieee80211_sub_if_data *sdata; | |
1378 | ||
1379 | if (state != NETDEV_CHANGENAME) | |
1380 | return 0; | |
1381 | ||
1382 | if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) | |
1383 | return 0; | |
1384 | ||
1385 | if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) | |
1386 | return 0; | |
1387 | ||
1388 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1389 | ||
1390 | memcpy(sdata->name, dev->name, IFNAMSIZ); | |
1391 | ||
1392 | ieee80211_debugfs_rename_netdev(sdata); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | static struct notifier_block mac80211_netdev_notifier = { | |
1397 | .notifier_call = netdev_notify, | |
1398 | }; | |
1399 | ||
1400 | int ieee80211_iface_init(void) | |
1401 | { | |
1402 | return register_netdevice_notifier(&mac80211_netdev_notifier); | |
1403 | } | |
1404 | ||
1405 | void ieee80211_iface_exit(void) | |
1406 | { | |
1407 | unregister_netdevice_notifier(&mac80211_netdev_notifier); | |
1408 | } |